IEEE C802.16maint-08/356r2
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Corrections To Support Non-macro-diversity Operation Within MBS Zone
Date
Submitted
2009-01-15
Source(s)
Tricci So, ZTE
mailto:
tso@zteusa.com
Jerry Chow, ZTE
jchow@zteusa.com
Re:
P802.16Rev2/D8, Sponsor Ballot Recirculation
Abstract
A solution is proposed that provides proper support for non-macro-diversity operation within an MBS
zone in a backwards compatible manner.
Purpose
Adoption toward REV2/D9
Notice
Release
Patent
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Corrections to Support Non-macro-diversity Operation Within MBS
Zone
Tricci So, Jerry Chow (ZTE)
Problem Statement:
Earlier changes for MBS support in 802.16 Rev2 introduced the support for non-macro-diversity operation within an
MBS zone but did not introduce the necessary protocol changes in MBS_MAP_IE in order to properly support it.
Specifically, MBS data burst transmissions could not be defined via MBS MAP messages within a permutation zone
for MBS, and therefore, loses some important functionality available to macro-diversity, such as MBS MAP message
chaining for power savings with MBS data reception when MS is in Idle Mode.
In addition, a looser level of synchronization of transmissions between BSs within an MBS zone operating without
macro-diversity was introduced at the same time. With this looser synchronization, only the same SDU or SDU
fragment content of the same MBS connections need to be sent within the same frame in time but the location within
the frame need not be the same between BSs. This level of synchronization is referred to as frame-level
synchronization. However, due to this operational difference, the macro-diversity mode of operation within an MBS
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IEEE C802.16maint-08/356r2
zone needs to be indicated to the MS.
Overview of the Solution:
The intent of this proposal is to provide the minimum amount of protocol changes necessary to properly support nonmacro-diversity operation within an MBS zone in a backwards compatible manner.
Proper Support of Non-macrodiversity MBS zone in MBS_MAP_IE
The way that MBS_MAP_IE is currently defined, specifying MBS data burst transmission via an MBS MAP
message in an MBS permutation zone is only defined for macro-diversity operation. This method of specifying MBS
data burst transmissions need to also apply for non-macro-diversity operation within MBS zones in order for nonmacro-diversity operation to benefit from this method of specifying MBS data burst transmissions, such as MBS
MAP message chaining for MS power savings.
The only change that is necessary is to provide some other mechanism for specifying whether macro-diversity is
supported or not within the MBS Zone since we need to allow for both macro-diversity and non-macro-diversity
operation within an MBS Zone and there no free reserved bits in the top level of the MBS_MAP_IE structure to
introduce a new bit in a backwards compatible manner. However, it is not necessary to retain the macro-diversity
attribute of an MBS Zone in the MBS_MAP_IE since we do not expect the level of data transmission
synchronization within an MBS zone to be dynamically changed – instead it is a nature of an MBS zone deployment
that should rarely change. Therefore, as part of this solution, we propose to move the announcement of the
synchronization level within an MBS Zone elsewhere and to rename the ‘Macro diversity enhanced’ field in
MBS_MAP_IE to reflect its updated meaning.
Specifying Support for Macro-diversity or Not Within MBS Zone
Specifying the mode of transmission and data synchronization applicable within an MBS zone when the mode is preprovisioned and rarely changed can be done in a number of ways but the two ways that requires the least changes to
the existing standard would be to associate this attribute of an MBS zone with the MBS zone identifier when it is
broadcast on the DCD and/or when it is communicated to the MS during MBS connection establishment or change.
However, based on backwards compatibility considerations, it is best to implement this via the MBS connection
management route since the DCD would be seen also by 16e-compliant MSs and it’s highly desirable to be able to
implement this without having to introduce new TLVs (i.e. try to modify existing TLVs in a backwards compatible
way). Also, changes to DCD have implications on MOB_NBR_ADV which has further backwards compatibility
considerations and should be avoided if not necessary. Therefore, the indication of the diversity mode within an
MBS zone is introduced in the ‘MBS service TLV’. Also, to support the co-existence of MBS zones with and
without macro-diversity in the same network that supports service continuity in between MBS zones, the indication
of the diversity mode of the neighboring MBS zone is added to the MCID Update Management encoding TLVs.
Backwards Compatibility Support for 16e-compatible MS
New capabilities negotiation TLV is added to allow new MSs to specifically indicate support for non-macrodiversity operation within MBS zone to the BS.
Backwards compatibility is made transparent to 16e-compatible MSs with prior functionality when an MBS zone is
operated with macro-diversity while using the same protocol elements (i.e. without having to introduce new TLVs
and IEs) by retaining the same bit and bit value in MBS_MAP_IE when macro-diversity operation is in effect.
When an MBS zone is operated without macro-diversity, 16e-compatible MSs can be offered another method of
receiving the MBS data (e.g. via unicast) or denied MBS service during MBS connection negotiation.
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IEEE C802.16maint-08/356r2
Proposed Modified Text to IEEE 802.16eRev2_D8:
[ Note to editor: modify subclause 8.4.5.3.12 at page 756-759 as follows]
8.4.5.3.12 MBS MAP IE
In the DL-MAP, a BS may transmit DIUC = 14 with the MBS_MAP_IE() to indicate when the next data for a
multicast and broadcast service flow will be transmitted. The offset value is associated with a CID value, and
indicates the frame that the next data will be transmitted in by using the CID value. (See Table 338.) The MBS MAP
message allocation parameters shall be included in the MBS MAP IE at regular intervals and if the MBS MAP
message allocation parameters change. MBS MAP IE is used to specify the MBS permutation zone. When an MBS
permutation zone exists in a frame, BS shall transmit MBS_MAP_IE with Macro diversity enhancedMBS
permutation zone defined = 1. The MBS permutation zone shall not use Adjacent subcarrier permutation.
When a BS needs to transmit Emergency Service Message in an MBS region, the BS shall transmit an
MBS_MAP_IE() with 'Macro diversity enhancedMBS permutation zone defined = 1' and 'Existence of Emergency
Service Message = 1'. If there is MBS_MAP IE in a DL-MAP message, MS shall decode it and check whether
Emergency Service Message(s) will be transmitted or not through an MBS permutation zone. If the MS supporting
the CS type used for ES detects the existence of Emergency Service Message(s) in the MBS region, the MS shall
decode the MBS-MAP message in order to identify the MBS data burst on which MAC PDU containing Emergency
Service Message(s) will be transmitted.
Table 337—MBS MAP IE
Size
(bit)
Syntax
MBS_MAP_IE() {
Notes
—
—
Extended-2 DIUC
4
MBS MAP IE = 0x00
Length
8
—
MBS Zone identifier
7
MBS Zone identifier corresponds to the
identifier provided by the BS at connection
initiation
Macro diversity enhancedMBS permutation
zone defined
1
0: Non Macro-Diversity enhanced zone;
MBS data burst is defined
1: Macro-Diversity enhanced MBS
permutation zone is defined
If(Macro diversity enhancedMBS permutation
zone defined = 1){
—
—
Permutation
2
0b00: PUSC permutation
0b01: FUSC permutation
0b10: Optional FUSC permutation
0b11: Adjacent subcarrier permutation
DL_PermBase
5
—
PRBS_ID
2
—
OFDMA Symbol Offset
7
The offset of the OFDMA symbol measured
in OFDMA symbols from beginning of the
DL frame in which the DL-MAP is
transmitted. Counting from the frame
preamble and starting from 0
MBS MAP message allocation included
indication
1
Used to indicate if the MBS MAP message
allocation parameters are included
Reserved
3
Shall be set to zero
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IEEE C802.16maint-08/356r2
Size
(bit)
Syntax
if (MBS MAP message allocation included
indication = 1) {
Notes
—
—
Reserved
3
—
Boosting
3
Refer to Table 320
DIUC
4
—
No. Subchannels
6
Indication of burst size of MBS MAP
message with the number of subchannels
NO. OFDMA symbols
6
Indication of burst size of MBS MAP
message with the number of OFDMA
symbols
Repetition Coding Indication
2
0b00—No repetition coding
0b01—Repetition coding of 2 used
0b10—Repetition coding of 4 used
0b11—Repetition coding of 6 used
}
—
—
} else {
—
—
DIUC
4
—
CID
16
CID for Single BS MBS service
OFDMA Symbol Offset
8
The offset of the first OFDMA symbol of
the MBS region measured in OFDMA
symbols from beginning of this DL frame.
Subchannel offset
6
The lowest index OFDMA subchannel used
for carrying the burst, starting from
subchannel 0.
Boosting
3
Refer to Table 320
SLC_3_indication
1
Used to notify sleep mode class 3 is used for
single BS MBS service
NO. OFDMA Symbols
6
—
NO. Subchannels
6
—
Repetition Coding Indication
2
0b00—No repetition coding
0b01—Repetition coding of 2 used
0b10—Repetition coding of 4 used
0b11—Repetition coding of 6 used
if (SLC 3_indication = 1) {
—
—
8
The Next MBS_MAP_IE Frame Offset
value is lower 8 bits of the frame number in
which the BS shall transmit the next MBS
MAP IE frame.
—
—
}
—
—
if !(byte boundary) {
—
—
Next MBS_MAP_IE Frame Offset
}
Padding Nibble
variable
}
}
4
Padding to reach byte boundary
—
—
—
—
IEEE C802.16maint-08/356r2
Macro diversity enhancedMBS permutation zone defined
Indicates if macro-diversity is used for access to MBS. Specifies method of allocation and location of
MBS data bursts. If this value is 1, an MBS permutation zone is defined in the frame and MBS data
burst allocations occur via MBS MAP message located in the MBS permutation zone.the type of
access is Multi-BS Access with macro-diversity. If this value is 0, a single MBS data burst allocation
is specified directly by the MBS MAP IE.it indicates that macro-diversity is not used.
Next MBS_MAP_IE Frame Offset
The Next MBS_MAP_IE Frame Offset value is the the lower 8 bits of the frame number in which the
BS shall transmit the next MBS MAP IE frame.
The burst carrying MBS MAP message shall be located at the first subchannel and first OFDMA symbol of the DL
permutation zone designated for the MBS zone that is specified by the MBS MAP IE. This burst shall be located in
the same frame as the MBS MAP IE that specifies it. The location of this DL permutation zone designated for the
MBS zone within the frame is specified by ‘OFDMA Symbol Offset’ in MBS MAP IE.
The MS should read the DL MAP for any frame in which it expects to receive MBS bursts or MBS MAP messages
to capture any possible change in the location of MBS permutation zone.
[ Note to editor: modify the text in the paragraph of subclause ‘6.3.27 Emegency Service’ at lines 6-15 on
page 497 as follows]
The BS may broadcast ESM(s) either through an MBS permutation zone or through a normal DL zone (e.g., PUSC,
FUSC and so on). If the BS decides to broadcast the ESM(s) through the MBS permutation zone, BS shall transmit
MBS_MAP_IE with indication of ESM existence in the MBS permutation zone (see 8.4.5.3.12 ). Even though an
MS isn’t watching MBS channel, the MS shall check at least the two parameters in an MBS_MAP IE (i.e., the Macro
diversity enhancedMBS permutation zone defined and the Existence of Emergency Service Message) if there is. If
the MS detects existence of ESM(s) through MBS permutation zone when MS decodes MBS_MAP IE, the MS shall
decode MBS_MAP message in order to identify the MBS data burst on which MAC PDU containing Emergency
Service Message(s) will be transmitted.
[ Note to editor: modify the text in the first paragraph of subclause 8.4.5.3.4 at lines 31-32 on page 743 as
follows]
8.4.5.3.4 STC DL Zone IE format
In the DL-MAP, a BS may transmit DIUC = 15 with the STC_DL_Zone_IE() to indicate that the subsequent
allocations shall use a specific permutation and/or use a specific Tx diversity mode. The DL frame shall start in
PUSC mode with no Tx diversity. Allocations subsequent to this IE shall use the permutation and Tx diversity mode
it instructs, until the next STC DL Zone IE, AAS DL IE or MBS_MAP_IE with Macro diversity enhancedMBS
permutation zone defined = 1. Allocation for a STC-capable SS shall be done through either DL_MAP_IE() or any
one of the MIMO-related IEs (MIMO_DL_Basic_IE(), MIMO_DL_Enhanced_IE(),
MIMO_DL_Chase_HARQ_subburst_IE, MIMO_DL_IR_HARQ_subburst_IE, MIMO_DL_IR_HARQ_
for_CC_subburst_IE, or MIMO_DL_STC_HARQ_subburst_IE). If DL_MAP_IE() is used, the matrix indicator in
STC_DL_Zone_IE() shall be used for the allocation with the number of individually encoded streams being 1. If any
one of the MIMO-related IEs is used, the matrix indicator in these IEs shall override the matrix indicator in
STC_DL_Zone_IE(). A DL zone can be a coordinated zone between the serving BS and all its neighbor BSs that has
the same zone boundary, the same zone permutation type e.g., PUSC, STC PUSC, AMC, and STC AMC, and the
same values for the parameters, Use All SC and Dedicated Pilots. Within a coordinated DL zone, all the allocations
shall have the parameter “boosting” set to 0b000, i.e., not boosted. A frame can have zero, one, or multiple
coordinated DL zones. The first PUSC zone can also be a coordinated DL zone. When the first PUSC zone is a
coordinated zone, serving BS coordinates with its neighbor BSs have the same zone boundary and use the same
“used-subchannel bitmap”. The format for the STC DL Zone IE is shown in Table 329.
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IEEE C802.16maint-08/356r2
[ Note to editor: modify subclause 11.13.22 on page 1321 as follows]
11.13.22 MBS service TLV
This TLV indicates whether the MBS service is being requested or provided for the connection that is being setup. A
value of 1 indicates that an MBS service limited to the serving BS is being requested and a value of 2 indicates
multi-BS-MBS with macro-diversity is being requested (either with or without Macro-diversity). A value of 3
indicates that multi-MBS without macro-diversity is being requested or provided. If MS or BS wants to initiate MBS
service, DSA-REQ with MBS service TLV shall be used. The DSA-RSP message shall contain the acceptance or
rejection of request and if there is no available MBS, MBS service value shall be set to 0.
Type
Length
Value
[145/146].4
1
0: No available MBS
1: MBS in Serving BS Only
2: MBS in a multi-BS Zone supporting macro-diversity
3: MBS in a multi-BS Zone not supporting macro-diversity
4-255: Reserved
Scope
DSA-REQ,
DSA-RSP,
DSA-ACK,
DSC-REQ,
DSC-RSP,
The BS shall only establish an MBS service type compatible with MS capabilities (refer to 11.7.24).
[ Note to editor: add subclause 11.7.24 at line 64 on page 1233 as follows]
11.7.24 MBS Capabilities
The MBS capability parameter indicates type of supported MBS service at the MAC level. If this TLV is not
included in REG-REQ and REG-RSP message, it indicates that MBS is not supported.
Type
46
Length
1
Value
Bit 0: MBS in Serving BS Only is supported.
Bit 1: Macro diversity Multi BS MBS is supported.
Bit 2: Non-macro-diversity Multi BS MBS is supported
Bit 3-7: Reserved.
Scope
REG-REQ, REG-RSP
The BS shall only configure an MBS service for which the MS is capable. The MBS service type associated with an
MBS connection is set by the MBS service TLV in the DSA-REQ/RSP/ACK message.
[ Note to editor: modify row and insert new row in ‘Table 562—MCID Pre-allocation and Transmission Info
definition’ in subclause 11.1.12.1 on page 1176 as follows]
Neighboring_MBS_ZONE_ID
78
MBS zone identifier for neighboring MBS Zone (bit#7 is not part of
identifier and set to 0)
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Neighboring zone type
1
0 – Neighbor MBS zone supports macro-diversity.
1 – Neighbor MBS zone does not support macro-diversity.
[ Note to editor: modify row and insert row in ‘Table 563—MCID Continuation List definition’ in subclause
11.1.12.2 on page 1177 as follows]
Neighboring_MBS_ZONE_ID
78
MBS zone identifier for neighboring MBS Zone (bit#7 is not part of
identifier and set to 0)
Neighboring zone type
1
0 – Neighbor MBS zone supports macro-diversity.
1 – Neighbor MBS zone does not support macro-diversity.
7